[POWERPC] Linkstation / kurobox support

Support for the Kurobox(HG)/LinkStation-I NAS systems by Buffalo
Technology, should be also applicable to the PPC TeraStation family.
Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>

arch/powerpc/boot/dts/kuroboxHG.dts

+/*
+ * Device Tree Souce for Buffalo KuroboxHG
+ *
+ * Choose CONFIG_LINKSTATION to build a kernel for KuroboxHG, or use
+ * the default configuration linkstation_defconfig.
+ *
+ * Based on sandpoint.dts
+ *
+ * 2006 (c) G. Liakhovetski <g.liakhovetski@gmx.de>
+ *
+ * This file is licensed under
+ * the terms of the GNU General Public License version 2.  This program
+ * is licensed "as is" without any warranty of any kind, whether express
+ * or implied.
+
+XXXX add flash parts, rtc, ??
+
+build with: "dtc -f -I dts -O dtb -o kuroboxHG.dtb -V 16 kuroboxHG.dts"
+
+
+ */
+
+/ {
+	linux,phandle = <1000>;
+	model = "KuroboxHG";
+	compatible = "linkstation";
+	#address-cells = <1>;
+	#size-cells = <1>;
+
+	cpus {
+		linux,phandle = <2000>;
+		#cpus = <1>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		PowerPC,603e { /* Really 8241 */
+			linux,phandle = <2100>;
+			linux,boot-cpu;
+			device_type = "cpu";
+			reg = <0>;
+			clock-frequency = <fdad680>;	/* Fixed by bootwrapper */
+			timebase-frequency = <1F04000>; /* Fixed by bootwrapper */
+			bus-frequency = <0>;		/* From bootloader */
+			/* Following required by dtc but not used */
+			i-cache-line-size = <0>;
+			d-cache-line-size = <0>;
+			i-cache-size = <4000>;
+			d-cache-size = <4000>;
+		};
+	};
+
+	memory {
+		linux,phandle = <3000>;
+		device_type = "memory";
+		reg = <00000000 08000000>;
+	};
+
+	soc10x { /* AFAICT need to make soc for 8245's uarts to be defined */
+		linux,phandle = <4000>;
+		#address-cells = <1>;
+		#size-cells = <1>;
+		#interrupt-cells = <2>;
+		device_type = "soc";
+		compatible = "mpc10x";
+		store-gathering = <0>; /* 0 == off, !0 == on */
+		reg = <80000000 00100000>;
+		ranges = <80000000 80000000 70000000	/* pci mem space */
+			  fc000000 fc000000 00100000	/* EUMB */
+			  fe000000 fe000000 00c00000	/* pci i/o space */
+			  fec00000 fec00000 00300000	/* pci cfg regs */
+			  fef00000 fef00000 00100000>;	/* pci iack */
+
+		i2c@80003000 {
+			linux,phandle = <4300>;
+			device_type = "i2c";
+			compatible = "fsl-i2c";
+			reg = <80003000 1000>;
+			interrupts = <5 2>;
+			interrupt-parent = <4400>;
+		};
+
+		serial@80004500 {
+			linux,phandle = <4511>;
+			device_type = "serial";
+			compatible = "ns16550";
+			reg = <80004500 8>;
+			clock-frequency = <7c044a8>;
+			current-speed = <2580>;
+			interrupts = <9 2>;
+			interrupt-parent = <4400>;
+		};
+
+		serial@80004600 {
+			linux,phandle = <4512>;
+			device_type = "serial";
+			compatible = "ns16550";
+			reg = <80004600 8>;
+			clock-frequency = <7c044a8>;
+			current-speed = <e100>;
+			interrupts = <a 0>;
+			interrupt-parent = <4400>;
+		};
+
+		pic@80040000 {
+			linux,phandle = <4400>;
+			#interrupt-cells = <2>;
+			#address-cells = <0>;
+			device_type = "open-pic";
+			compatible = "chrp,open-pic";
+			interrupt-controller;
+			reg = <80040000 40000>;
+			built-in;
+		};
+
+		pci@fec00000 {
+			linux,phandle = <4500>;
+			#address-cells = <3>;
+			#size-cells = <2>;
+			#interrupt-cells = <1>;
+			device_type = "pci";
+			compatible = "mpc10x-pci";
+			reg = <fec00000 400000>;
+			ranges = <01000000 0        0 fe000000 0 00c00000
+				  02000000 0 80000000 80000000 0 70000000>;
+			bus-range = <0 ff>;
+			clock-frequency = <7f28155>;
+			interrupt-parent = <4400>;
+			interrupt-map-mask = <f800 0 0 7>;
+			interrupt-map = <
+				/* IDSEL 0x11 - IRQ0 ETH */
+				5800 0 0 1 4400 0 1
+				5800 0 0 2 4400 1 1
+				5800 0 0 3 4400 2 1
+				5800 0 0 4 4400 3 1
+				/* IDSEL 0x12 - IRQ1 IDE0 */
+				6000 0 0 1 4400 1 1
+				6000 0 0 2 4400 2 1
+				6000 0 0 3 4400 3 1
+				6000 0 0 4 4400 0 1
+				/* IDSEL 0x14 - IRQ3 USB2.0 */
+				7000 0 0 1 4400 3 1
+				7000 0 0 2 4400 3 1
+				7000 0 0 3 4400 3 1
+				7000 0 0 4 4400 3 1
+			>;
+		};
+	};
+};

arch/powerpc/platforms/embedded6xx/Kconfig

@@ -74,6 +74,18 @@ config SANDPOINT
 	  Select SANDPOINT if configuring for a Motorola Sandpoint X3
 	  (any flavor).
 
+config LINKSTATION
+	bool "Linkstation / Kurobox(HG) from Buffalo"
+	select MPIC
+	select FSL_SOC
+	select PPC_UDBG_16550 if SERIAL_8250
+	help
+	  Select LINKSTATION if configuring for one of PPC- (MPC8241)
+	  based NAS systems from Buffalo Technology. So far only
+	  KuroboxHG has been tested. In the future classical Kurobox,
+	  Linkstation-I HD-HLAN and HD-HGLAN versions, and PPC-based
+	  Terastation systems should be supported too.
+
 config MPC7448HPC2
 	bool "Freescale MPC7448HPC2(Taiga)"
 	select TSI108_BRIDGE
@@ -196,7 +208,7 @@ config PPC_GEN550
 	depends on SANDPOINT || SPRUCE || PPLUS || \
 		PRPMC750 || PRPMC800 || LOPEC || \
 		(EV64260 && !SERIAL_MPSC) || CHESTNUT || RADSTONE_PPC7D || \
-		83xx
+		83xx || LINKSTATION
 	default y
 
 config FORCE
@@ -270,13 +282,13 @@ config EPIC_SERIAL_MODE
 
 config MPC10X_BRIDGE
 	bool
-	depends on POWERPMC250 || LOPEC || SANDPOINT
+	depends on POWERPMC250 || LOPEC || SANDPOINT || LINKSTATION
 	select PPC_INDIRECT_PCI
 	default y
 
 config MPC10X_OPENPIC
 	bool
-	depends on POWERPMC250 || LOPEC || SANDPOINT
+	depends on POWERPMC250 || LOPEC || SANDPOINT || LINKSTATION
 	default y
 
 config MPC10X_STORE_GATHERING

arch/powerpc/platforms/embedded6xx/Makefile

@@ -2,3 +2,4 @@
 # Makefile for the 6xx/7xx/7xxxx linux kernel.
 #
 obj-$(CONFIG_MPC7448HPC2)	+= mpc7448_hpc2.o
+obj-$(CONFIG_LINKSTATION)	+= linkstation.o ls_uart.o

arch/powerpc/platforms/embedded6xx/linkstation.c

+/*
+ * Board setup routines for the Buffalo Linkstation / Kurobox Platform.
+ *
+ * Copyright (C) 2006 G. Liakhovetski (g.liakhovetski@gmx.de)
+ *
+ * Based on sandpoint.c by Mark A. Greer
+ *
+ * This file is licensed under the terms of the GNU General Public License
+ * version 2.  This program is licensed "as is" without any warranty of
+ * any kind, whether express or implied.
+ */
+
+#include <linux/kernel.h>
+#include <linux/pci.h>
+#include <linux/initrd.h>
+#include <linux/root_dev.h>
+#include <linux/mtd/physmap.h>
+
+#include <asm/time.h>
+#include <asm/prom.h>
+#include <asm/mpic.h>
+#include <asm/mpc10x.h>
+#include <asm/pci-bridge.h>
+
+static struct mtd_partition linkstation_physmap_partitions[] = {
+	{
+		.name   = "mtd_firmimg",
+		.offset = 0x000000,
+		.size   = 0x300000,
+	},
+	{
+		.name   = "mtd_bootcode",
+		.offset = 0x300000,
+		.size   = 0x070000,
+	},
+	{
+		.name   = "mtd_status",
+		.offset = 0x370000,
+		.size   = 0x010000,
+	},
+	{
+		.name   = "mtd_conf",
+		.offset = 0x380000,
+		.size   = 0x080000,
+	},
+	{
+		.name   = "mtd_allflash",
+		.offset = 0x000000,
+		.size   = 0x400000,
+	},
+	{
+		.name   = "mtd_data",
+		.offset = 0x310000,
+		.size   = 0x0f0000,
+	},
+};
+
+static int __init add_bridge(struct device_node *dev)
+{
+	int len;
+	struct pci_controller *hose;
+	int *bus_range;
+
+	printk("Adding PCI host bridge %s\n", dev->full_name);
+
+	bus_range = (int *) get_property(dev, "bus-range", &len);
+	if (bus_range == NULL || len < 2 * sizeof(int))
+		printk(KERN_WARNING "Can't get bus-range for %s, assume"
+				" bus 0\n", dev->full_name);
+
+	hose = pcibios_alloc_controller();
+	if (hose == NULL)
+		return -ENOMEM;
+	hose->first_busno = bus_range ? bus_range[0] : 0;
+	hose->last_busno = bus_range ? bus_range[1] : 0xff;
+	hose->arch_data = dev;
+	setup_indirect_pci(hose, 0xfec00000, 0xfee00000);
+
+	/* Interpret the "ranges" property */
+	/* This also maps the I/O region and sets isa_io/mem_base */
+	pci_process_bridge_OF_ranges(hose, dev, 1);
+
+	return 0;
+}
+
+static void __init linkstation_setup_arch(void)
+{
+	struct device_node *np;
+#ifdef CONFIG_MTD_PHYSMAP
+	physmap_set_partitions(linkstation_physmap_partitions,
+			       ARRAY_SIZE(linkstation_physmap_partitions));
+#endif
+
+#ifdef CONFIG_BLK_DEV_INITRD
+	if (initrd_start)
+		ROOT_DEV = Root_RAM0;
+	else
+#endif
+#ifdef	CONFIG_ROOT_NFS
+		ROOT_DEV = Root_NFS;
+#else
+		ROOT_DEV = Root_HDA1;
+#endif
+
+	/* Lookup PCI host bridges */
+	for (np = NULL; (np = of_find_node_by_type(np, "pci")) != NULL;)
+		add_bridge(np);
+
+	printk(KERN_INFO "BUFFALO Network Attached Storage Series\n");
+	printk(KERN_INFO "(C) 2002-2005 BUFFALO INC.\n");
+}
+
+/*
+ * Interrupt setup and service.  Interrrupts on the linkstation come
+ * from the four PCI slots plus onboard 8241 devices: I2C, DUART.
+ */
+static void __init linkstation_init_IRQ(void)
+{
+	struct mpic *mpic;
+	struct device_node *dnp;
+	void *prop;
+	int size;
+	phys_addr_t paddr;
+
+	dnp = of_find_node_by_type(NULL, "open-pic");
+	if (dnp == NULL)
+		return;
+
+	prop = (struct device_node *)get_property(dnp, "reg", &size);
+	paddr = (phys_addr_t)of_translate_address(dnp, prop);
+
+	mpic = mpic_alloc(dnp, paddr, MPIC_PRIMARY | MPIC_WANTS_RESET, 4, 32, " EPIC     ");
+	BUG_ON(mpic == NULL);
+
+	/* PCI IRQs */
+	mpic_assign_isu(mpic, 0, paddr + 0x10200);
+
+	/* I2C */
+	mpic_assign_isu(mpic, 1, paddr + 0x11000);
+
+	/* ttyS0, ttyS1 */
+	mpic_assign_isu(mpic, 2, paddr + 0x11100);
+
+	mpic_init(mpic);
+}
+
+extern void avr_uart_configure(void);
+extern void avr_uart_send(const char);
+
+static void linkstation_restart(char *cmd)
+{
+	local_irq_disable();
+
+	/* Reset system via AVR */
+	avr_uart_configure();
+	/* Send reboot command */
+	avr_uart_send('C');
+
+	for(;;)  /* Spin until reset happens */
+		avr_uart_send('G');	/* "kick" */
+}
+
+static void linkstation_power_off(void)
+{
+	local_irq_disable();
+
+	/* Power down system via AVR */
+	avr_uart_configure();
+	/* send shutdown command */
+	avr_uart_send('E');
+
+	for(;;)  /* Spin until power-off happens */
+		avr_uart_send('G');	/* "kick" */
+	/* NOTREACHED */
+}
+
+static void linkstation_halt(void)
+{
+	linkstation_power_off();
+	/* NOTREACHED */
+}
+
+static void linkstation_show_cpuinfo(struct seq_file *m)
+{
+	seq_printf(m, "vendor\t\t: Buffalo Technology\n");
+	seq_printf(m, "machine\t\t: Linkstation I/Kurobox(HG)\n");
+}
+
+static int __init linkstation_probe(void)
+{
+	unsigned long root;
+
+	root = of_get_flat_dt_root();
+
+	if (!of_flat_dt_is_compatible(root, "linkstation"))
+		return 0;
+	return 1;
+}
+
+define_machine(linkstation){
+	.name 			= "Buffalo Linkstation",
+	.probe 			= linkstation_probe,
+	.setup_arch 		= linkstation_setup_arch,
+	.init_IRQ 		= linkstation_init_IRQ,
+	.show_cpuinfo 		= linkstation_show_cpuinfo,
+	.get_irq 		= mpic_get_irq,
+	.restart 		= linkstation_restart,
+	.power_off 		= linkstation_power_off,
+	.halt	 		= linkstation_halt,
+	.calibrate_decr 	= generic_calibrate_decr,
+};

arch/powerpc/platforms/embedded6xx/ls_uart.c

+#include <linux/workqueue.h>
+#include <linux/string.h>
+#include <linux/delay.h>
+#include <linux/serial_reg.h>
+#include <linux/serial_8250.h>
+#include <asm/io.h>
+#include <asm/mpc10x.h>
+#include <asm/ppc_sys.h>
+#include <asm/prom.h>
+#include <asm/termbits.h>
+
+static void __iomem *avr_addr;
+static unsigned long avr_clock;
+
+static struct work_struct wd_work;
+
+static void wd_stop(void *unused)
+{
+	const char string[] = "AAAAFFFFJJJJ>>>>VVVV>>>>ZZZZVVVVKKKK";
+	int i = 0, rescue = 8;
+	int len = strlen(string);
+
+	while (rescue--) {
+		int j;
+		char lsr = in_8(avr_addr + UART_LSR);
+
+		if (lsr & (UART_LSR_THRE | UART_LSR_TEMT)) {
+			for (j = 0; j < 16 && i < len; j++, i++)
+				out_8(avr_addr + UART_TX, string[i]);
+			if (i == len) {
+				/* Read "OK" back: 4ms for the last "KKKK"
+				   plus a couple bytes back */
+				msleep(7);
+				printk("linkstation: disarming the AVR watchdog: ");
+				while (in_8(avr_addr + UART_LSR) & UART_LSR_DR)
+					printk("%c", in_8(avr_addr + UART_RX));
+				break;
+			}
+		}
+		msleep(17);
+	}
+	printk("\n");
+}
+
+#define AVR_QUOT(clock) ((clock) + 8 * 9600) / (16 * 9600)
+
+void avr_uart_configure(void)
+{
+	unsigned char cval = UART_LCR_WLEN8;
+	unsigned int quot = AVR_QUOT(avr_clock);
+
+	if (!avr_addr || !avr_clock)
+		return;
+
+	out_8(avr_addr + UART_LCR, cval);			/* initialise UART */
+	out_8(avr_addr + UART_MCR, 0);
+	out_8(avr_addr + UART_IER, 0);
+
+	cval |= UART_LCR_STOP | UART_LCR_PARITY | UART_LCR_EPAR;
+
+	out_8(avr_addr + UART_LCR, cval);			/* Set character format */
+
+	out_8(avr_addr + UART_LCR, cval | UART_LCR_DLAB);	/* set DLAB */
+	out_8(avr_addr + UART_DLL, quot & 0xff);		/* LS of divisor */
+	out_8(avr_addr + UART_DLM, quot >> 8);			/* MS of divisor */
+	out_8(avr_addr + UART_LCR, cval);			/* reset DLAB */
+	out_8(avr_addr + UART_FCR, UART_FCR_ENABLE_FIFO);	/* enable FIFO */
+}
+
+void avr_uart_send(const char c)
+{
+	if (!avr_addr || !avr_clock)
+		return;
+
+	out_8(avr_addr + UART_TX, c);
+	out_8(avr_addr + UART_TX, c);
+	out_8(avr_addr + UART_TX, c);
+	out_8(avr_addr + UART_TX, c);
+}
+
+static void __init ls_uart_init(void)
+{
+	local_irq_disable();
+
+#ifndef CONFIG_SERIAL_8250
+	out_8(avr_addr + UART_FCR, UART_FCR_ENABLE_FIFO);	/* enable FIFO */
+	out_8(avr_addr + UART_FCR, UART_FCR_ENABLE_FIFO |
+	      UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT);	/* clear FIFOs */
+	out_8(avr_addr + UART_FCR, 0);
+	out_8(avr_addr + UART_IER, 0);
+
+	/* Clear up interrupts */
+	(void) in_8(avr_addr + UART_LSR);
+	(void) in_8(avr_addr + UART_RX);
+	(void) in_8(avr_addr + UART_IIR);
+	(void) in_8(avr_addr + UART_MSR);
+#endif
+	avr_uart_configure();
+
+	local_irq_enable();
+}
+
+static int __init ls_uarts_init(void)
+{
+	struct device_node *avr;
+	phys_addr_t phys_addr;
+	int len;
+
+	avr = of_find_node_by_path("/soc10x/serial@80004500");
+	if (!avr)
+		return -EINVAL;
+
+	avr_clock = *(u32*)get_property(avr, "clock-frequency", &len);
+	phys_addr = ((u32*)get_property(avr, "reg", &len))[0];
+
+	if (!avr_clock || !phys_addr)
+		return -EINVAL;
+
+	avr_addr = ioremap(phys_addr, 32);
+	if (!avr_addr)
+		return -EFAULT;
+
+	ls_uart_init();
+
+	INIT_WORK(&wd_work, wd_stop, NULL);
+	schedule_work(&wd_work);
+
+	return 0;
+}
+
+late_initcall(ls_uarts_init);